Chin cup



FIG. 1 is a front elevation view for my chin cup;

FIG. 2 is a top plan view my design;

FIG. 3 is a left side elevation view of my design, a right side elevation view being identical;

FIG. 4 is a bottom plan view of my design;

FIG. 5 is a front elevation exploded view of my design showing the upper element separated from the lower element;

FIG. 6 is a top plan exploded view of my design showing the upper element separated from the lower element; and,

FIG. 7 is a front perspective view of my design.

The brackets in FIGS. 5 and 6 depict the relationship of the top and bottom parts of my design before they are joined, and the illustrative broken lines of straps in FIG. 7 depict exemplary components which might be used in conjunction with my chin cup, and form no part of the claimed design. 

CLAIM The ornamental design for a chin cup, as shown and described. 